With the --insecure-registry daemon option (or talking to a registry on
a local IP), the daemon will first try TLS, and then try plaintext if
something goes wrong with the push or pull. It doesn't make sense to try
plaintext if a HTTP request went through while using TLS. This commit
changes the logic to keep track of host/port combinations where a TLS
attempt managed to do at least one HTTP request (whether the response
code indicated success or not). If the host/port responded to a HTTP
using TLS, we won't try to make plaintext HTTP requests to it.
This will result in better error messages, which sometimes ended up
showing the result of the plaintext attempt, like this:
Error response from daemon: Get
http://myregistrydomain.com:5000/v2/: malformed HTTP response
"\x15\x03\x01\x00\x02\x02"
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
Several improvements to error handling:
- Introduce ImageConfigPullError type, wrapping errors related to
downloading the image configuration blob in schema2. This allows for a
more descriptive error message to be seen by the end user.
- Change some logrus.Debugf calls that display errors to logrus.Errorf.
Add log lines in the push/pull fallback cases to make sure the errors
leading to the fallback are shown.
- Move error-related types and functions which are only used by the
distribution package out of the registry package.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
